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I have a DDR2 800 400Mhz, which one is the frequency? 800 or 400?

1.5gb of DDR2 rami have a motherboard with 2 DDR2 slots, right now each one has 512mb. If i were to remove one off them and insert a 1gb stick, now having 1.5gb installed.
is this possible (Motherboard model on my system specs)

Hardware & Devices

DDR2 Laptop to Desktop DDR2i have an old laptop which has 4 gigs DDR2 using 2 channels, is there any adapter or linker which would allow me to connect my laptop memory to my desktop sized slot

my pc6400 ram is running at 400mhz!??i have 3gb of pc6400 ram in my pc which if im correct should run at 800mhz but when i check threw speccy it says my ram is at 400mhz. 400mhz is what pc3200 should run not 6400. do u think my ram is underclocked? what should i do to fix this problem.